JPH04217574A - Overstroke measuring device for hydraulic elevator plunger - Google Patents

Abstract

PURPOSE:To measure the overstroke of a hydraulic elevator plunger in a short time by one operator alone. CONSTITUTION:There is provided an arithmetic unit which counts the output pulse numbers of a rotary encoder 12, and simultaneously converts this pulse number into length, thereby counting the pulse number from a position according a floor of an elevator cage 6 with a uppermost floor 7 to a position where the lower part of a plunger hits on a cylinder upper part. Then, this pulse number is converted into length, thus this length comes to an overstroke. A reduction in labor cost and an improvement in operation efficiency both are well promotable.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator plunger overstroke measuring device for measuring the overstroke of a plunger that raises and lowers a car of a hydraulic elevator.

0002

2. Description of the Related Art As shown in FIG. 3, a hydraulic elevator is equipped with a pulley 4 at the upper end of a plunger 3 that drives a hydraulic cylinder 2 installed in a hoistway 1, and a rope 5 wound around the pulley 4. One end is connected to the hydraulic cylinder 2, and the other end is connected to the car 6, so that the car 6 can be moved up and down by hydraulic control. Cart 6
The method of measuring the overstroke x from the position where the floor of the car 6 matches the landing floor 7 of the top floor until the bottom of the plunger 3 hits the top of the cylinder 2 is based on a conventional method using an up-prime switch that prevents the car 6 from rising too high. 8 and the plunger limit switch 9 that prevents the plunger 3 from protruding excessively, the car 6 is raised at low speed, and the lower part of the plunger 3 hits the upper part of the cylinder 2, causing the car 6 to stop. The distance y between the floor and the landing floor 7 on the top floor was measured and y was taken as the overstroke value.

0003

[Problems to be Solved by the Invention] In the above-mentioned prior art, when measuring the overstroke of a plunger, the operator climbs on the ceiling of the car and removes the upper limit switch and the plunger limit switch. This requires two workers: one to drive the car at low speed until it hits the top floor, and the other to measure the distance between the car floor and the top landing floor. There was a problem in that it took time and effort to remove the Mituto switch.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic elevator plunger overstroke measuring device that allows one worker to measure the overstroke of a hydraulic elevator plunger in a short time.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, there are provided an upper limit switch that prevents the car from rising excessively, a plunger limit switch that prevents the plunger driving inside the cylinder from protruding excessively, and the above-mentioned A hydraulic elevator having a stop circuit that stops the upward movement of the car when either the upper limit switch or the plunger limit switch operates, and a rotary encoder that outputs a pulse signal according to the amount of elevation of the car. The plunger overstroke measuring device can be operated by turning on a position detection device that emits a signal at the position where the top floor landing floor and the car floor match, and a maintenance operation switch that switches the elevator car to low-speed operation. a short circuit that disables the operation of the upper limit switch and the plunger limit switch, a buzzer that sounds when the short circuit is turned on, and an arithmetic circuit that is activated when the short circuit is turned on; and a calculation device that calculates the number of output pulses of the rotary encoder after the position detection device issues a signal until the stopper attached to the bottom of the plunger hits the top of the cylinder and stops. be.

[0006]

[Operation] Turn on the maintenance operation switch that switches the car from high-speed operation to low-speed operation, and by turning on this maintenance operation switch, the circuit that short-circuits the up-limit switch and the plunger limit switch becomes operational, and this short circuit When you turn on the switch, the at-prime limit switch and
Each plunger limit switch is short-circuited, disabling the switch operation, and a buzzer is sounded to notify that a short circuit has been formed.A calculation device is also installed to count the number of output pulses of the rotary encoder and convert it to length. When the car is operated and the car performs a low-speed ascending operation, and the car floor matches the top floor, the position detection outputs an output to the calculation device, the calculation device counts the number of pulses of the rotary encoder, and the bottom of the plunger moves to the top of the cylinder. When this occurs and no further upward movement is possible and the low speed upward movement is stopped, the arithmetic unit stops the pulse count of the rotary encoder, converts the total number of pulses counted into a length, and calculates the value converted to this length. is the overstroke of the plunger. Thereby, the work of measuring the overstroke of the plunger can be carried out by only one worker, and the measuring time can be greatly shortened.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the overstroke measuring device for a hydraulic elevator plunger according to the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a side view showing an embodiment of the overstroke measuring device for a hydraulic elevator plunger according to the present invention.
FIG. 2 is an electrical circuit diagram inside the measuring device.

In FIG. 1, a connecting body 10 that moves as the car 6 moves up and down is wound around a pulley 11 at the top of the hoistway 1 and around a rotary encoder 12 at the bottom of the hoistway 2. This rotary encoder 12 is a connecting body 10
It rotates due to the movement of the robot and emits a pulse signal. Also, when the floor of the car 6 and the top floor 7 match, the car 6
The magnetic sensor 13 attached to the hoistway 1 and the shielding plate 14 provided on the hoistway 1 are attached so as to fit together to detect the position.

A measuring device 15 is also connected to a control panel (not shown) located in the machine room. As shown by broken lines in the figure, the upper limit switch 8, the plunger limit switch 9, the rotary encoder 12, and the magnetic sensor 13 are connected to the measuring device 15 via a control panel (not shown).

The circuit inside the measuring device 15 will be explained with reference to FIG.

Maintenance switch 1 installed between power supplies P and N
6, the low speed operation command relay 17 is energized, and 171
, 172 are normally open contacts of the low speed operation command relay 17, and when the low speed ascending operation button 18 is pressed, the low speed ascending operation relay 19 having normally closed contacts 191 and 192 is energized, and the car 6 starts to ascend at a low speed. Drive. The normally closed contact 81 of the upper limit switch, the normally closed contact 91 of the plunger limit switch, the normally closed contact N1 of a safety device (not shown), and the safety switch operation detection relay 20 are connected in series. When the power is de-energized, the elevator car 6 stops moving up and down. The overstroke measuring switch 21, the normally open contact 172, and the short circuit relay 22 are connected in series, and the normally closed contact 221 of the short circuit relay 22 is connected to the connection point between the power supply P and the normally closed contact 81, and the normally closed contacts 81, 91. are connected in parallel to disable opening. Also, a buzzer BZ is connected via the measurement switch 21, and a measurement start relay 23 and a measurement preparation relay 2 are connected via the measurement switch 21.
4 are connected, and the measurement start relay 23 is connected to the normally open contact 241 of the measurement preparation relay 24 and the magnetic sensor 13.
The measurement preparation relay 2 is connected in series with the normally open contact 131 of the
4 is connected to the normally closed contact 132 of the magnetic sensor 13, and the normally open contact 242 for self-holding and the normally closed contact 132 are connected in parallel.

The pulse signal from the rotary encoder 12 is input to the input terminal I of the arithmetic unit 25. This arithmetic unit 25 starts counting pulses input from the input terminal I when a signal is input to the start terminal ST, stops pulse counting when a signal is input to the stop terminal SP, and converts the counted value into a distance. Perform the calculation to
The calculation result is displayed from the output terminal O on the display device 26 as the overstroke value. Further, when a signal is input to the reset terminal R, the calculation result of the calculation device 25 is reset. Further, Tr1 to Tr3 are transistors for driving, and their respective collectors are connected to the power supply P, and r1 to r3 are pull-down resistors respectively connected to the power supply N, and normally open contacts 191 and 231 are connected to the transistors T.
connected to the base of r1 and its connection point and start terminal ST
is connected. The normally closed contact 192 is a transistor Tr.
A pull-down resistor r2 is connected to the emitter of the transistor Tr2, and the connection point thereof is connected to a stop terminal SP. The normally closed contact 222 is connected to the base of the transistor Tr3, and the normally closed contact 222 is connected to the base of the transistor Tr3.
A pull-down resistor r3 is connected thereto, and its connection point is connected to the reset terminal R.

Next, the operation will be explained.

When the worker turns on the maintenance switch 16, the low speed operation command relay 17 is energized by the P-16-17-N circuit, its normally open contacts 171 and 172 are closed, and the measurement switch 21 is turned on. When input, P-21-172-
The short circuit relay 22 is energized by the circuit 22-N, the normally closed contact 221 is closed, and the opening of the normally closed contacts 81 and 92 is disabled by the circuit P-221-N1-20-N. A short circuit is formed, and at the same time, the buzzer starts sounding by the circuit of P-21-BZ-N. Next, when the worker presses the low-speed ascending operation button 18, the low-speed ascending operation relay 19 is energized by the circuit P-18-171-19-N, and the car 6
starts low-speed ascending operation. The normally closed contact 132 of the magnetic sensor 13 is closed, and the measurement preparation relay 24 is energized from the P-21-132-24-N circuit, and the P-2
It is self-maintained by the circuit 1-242-24-N. When the car 6 reaches the position of the top floor 7, the magnetic sensor 13 is fitted to the shielding plate 14, and the normally open contact 131 of the magnetic sensor 13 is closed, so measurement is performed from the circuit P-21-241-23-N. The starting relay 23 is energized, and the P-191-231-T
Since the r1-r1-N circuit is formed, a signal is input to the start terminal ST of the arithmetic unit 25, and counting of pulses input from the rotary encoder 12 to the input terminal I is started. If the low speed rising operation button 18 is further pressed, the plunger 3 continues to rise until the lower part of the plunger 3 hits the upper part of the cylinder 2 and stops. When the worker confirms that the car 6 has stopped, he releases the low-speed ascending operation button 18, the low-speed ascending operation relay 19 is deenergized, and the P-192-Tr2-r2-N
Since the circuit is formed, a signal is input to the stop terminal SP, the pulse counting from the rotary encoder 12 is stopped, the counted number of pulses is converted to a distance, and the converted signal is sent from the output terminal O to the display device 26. The overstroke value of the plunger 3 is displayed on the display device 26. Furthermore, when the measurement switch is released, the short circuit relay 22 is deenergized and the buzzer BZ also stops sounding.
Further, a signal is inputted to the reset terminal R of the arithmetic device 25 through the circuit P-222-Tr3-r3-N, the arithmetic result is reset, and the display device 26 is also turned off.

In this embodiment, the overstroke value of the plunger 3 can be easily measured, and since the buzzer BZ sounds when the measurement switch is turned on, there is no need to forget to turn off the measurement switch.

[0017]

According to the present invention, the overstroke of the plunger can be measured by one worker by counting the number of pulses of the rotary encoder and calculating the number of pulses. It has the effect of shortening time.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of an overstroke measuring device for a hydraulic elevator plunger according to the present invention.

FIG. 2 is an electrical circuit diagram within the measuring device.

FIG. 3 is a side view of a hydraulic elevator showing a conventional method for measuring overstroke of a hydraulic elevator plunger.

[Explanation of symbols]

2 Cylinder 3 Plunger 6 Cart 7 Top floor landing 8　Appoint limit switch 9 Plunge limit switch 12 Rotary encoder 13 Magnetic sensor 14 Shielding plate 16 Maintenance switch 18 Low speed ascending operation button 22 Short circuit relay 25 Arithmetic device 26 Display device BZ Buzzer

Claims (1)

[Claims] 1. An upper limit switch that prevents the car from rising too high; a plunger limit switch that prevents the plunger driving inside the cylinder from protruding too much; and any one of the upper limit switch and the plunger limit switch. An overstroke measuring device for a hydraulic elevator plunger, which has a stop circuit that stops the elevator car when one of the elevator cars operates, and a rotary encoder that outputs a pulse signal according to the amount of the elevator car going up and down.
a position detection device that emits a signal at a position where the top floor landing floor and the car floor match; a short circuit that becomes operable by turning on a maintenance operation switch that switches the elevator car to low-speed operation; A short circuit that disables the operation of the plunger limit switch and the plunger limit switch, a buzzer that sounds when the short circuit is turned on, an arithmetic circuit that is activated when the short circuit is turned on, and a position detection device that emits a signal. and a calculation device that calculates the number of output pulses of the rotary encoder until a stopper attached to the bottom of the plunger hits the top of the cylinder and stops. Stroke measuring device.